nm: deactivate when auto-route-table-id changes

NetworkManager reapply does not fully migrate IPv6 proto kernel routes
when ipv4/ipv6.route-table changes. Deactivate and reactivate first so
routes leave the old table.

Resolves: https://redhat.atlassian.net/browse/RHEL-178772

Assisted-By: Claude Sonnet 5
Signed-off-by: Branislav Kadlec <bkadlec@redhat.com>
Co-authored-by: Cursor <cursoragent@cursor.com>